Motorola GM950 Podręcznik - Strona 9

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3.6

Liquid Crystal Display (LCD)

The LCD display H0931 is a 3 digit / 7 segment display which incorporates (11) annunciators. Data

is loaded serially into the display driver U0932 via the SPI interface. The display data of line SPI

DATA BUF is shifted serially into the display driver by clock signal LCD CLCK BUF. When the last bit

has been received, the LCD display is updated.

3.7

Signals BUS+, PTT, HOOK VPP, MIC HI, HANDSET AUDIO from the microphone connector (J0903)

are fed to the radio's controller section via connector (J0901) .

3.8

Speaker

The Control Head contains a speaker for the receiver audio. The receiver audio signal from the

differential audio output of the audio ampliﬁer located on the radio's controller is fed via lines INT

SPKR+, INT SPKR-, connector (J0901-18,17) to the speaker connector (J0902) pin 1 and pin 2. The

speaker is connected to the connector (J0902) .

3.9

Electrostatic transient protection is provided for the sensitive components in the Control Head by

diodes (VR0901 - VR0909). The diodes limit any transient voltages to tolerable levels. The

associated capacitors provide Radio Frequency Interference (RFI) protection.

3.10

Reversible Control Head

The control head is connected to the RF transceiver by means of a short ﬂexible ribbon cable. This

allows the control head to be mounted either way up in relation to the body of the transceiver. This

means that the transceiver can be mounted in the most cosmetically pleasing and most efﬁcient

cooling orientation and still have the user interface the "right way" up.

Introduction/Theory of Operation

Theory of Operation

4B.1-3